2-9. EXPANSION VALVE CONTROL (LEV CONTROL)

(1) Outline of LEV control

The LEV basic control is comprised of setting LEV opening degree to the standard opening °F set for each operational frequency of the compressor. However, when any change in indoor/outdoor temperatures or other factors cause air con- ditioning load fluctuation, the LEV control also works to correct LEV opening degree based on discharge temperature (Shell temperature) of the compressor, developing the unit’s performance.

Standard specification

General operation

 

Minimum

: 33 pulse (MUZ-A09/12/15/17 MUY-A15/17)

 

 

59 pulse (MUZ-A24 MUY-A24)

Control range

 

54 pulse (MUZ-FD)

 

 

58 pulse (MUZ-DMUY-D)

 

Maximum

: 500 pulse

Actuating speed

Open : 40 pulse/second

Close : 90 pulse/second.

 

 

 

Opening degree adjustment

LEV opening degree is always adjusted in opening direction.

 

(When reducing the opening degree, LEV is once over-closed,

 

and then adjusted to the proper degree by opening.

Unit OFF

LEV remains at maximum opening degree (reaches maximum

 

opening degree approximate in 15 minutes after compressor

 

stops)

 

 

 

Remote controller ON

LEV is positioned. (first full-closed at zero pulse and then posi-

 

tioned.)

 

COOL · DRY MODE

LEV is fixed to standard opening degree according to opera-

During 1 to 5 minutes after compressor starts

tional frequency of compressor.

HEAT MODE

 

 

During 1 to 15 minutes after compressor starts

 

 

More than 5 (COOL, DRY), 15 (HEAT (MUZ)) minutes

LEV opening degree is corrected to get target discharge tem-

have passed since compressor start-up

perature of compressor.

 

(For lower discharge temperature than target temperature,

 

LEV is corrected in closing direction.)

 

(For higher discharge temperature than target temperature,

 

LEV is corrected in opening direction.)

 

It may take more than 30 minutes to reach target tempera-

 

ture, depending on operating conditions.

 

 

 

Thermostat OFF

LEV is adjusted to exclusive opening degree for thermostat

 

 

OFF.

 

 

 

Thermostat ON

LEV is controlled in the same way as that after the compres-

 

sor has started up.

 

 

Defrosting in HEAT mode

LEV is adjusted to open 500 pulse.

 

 

 

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Mitsubishi Electronics MUZ-FDNA - U Expansion Valve Control LEV Control, Pulse MUZ-A09/12/15/17 MUY-A15/17, Heat Mode

MSZ-FDNA, MUZ-FDNA - U, MUZ-FDNA, MUZ-ANA - U, MUY-ANA specifications

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